i Return period T
(yr)
Probability P
(percent)
Frequency factor K y= log(Q) Flood discharge Q
(m3/s)
1 1.05 95.2 -1.677 2.839 691
2 1.11 90.1 -1.293 2.919 829
3 1.25 80 -0.835 3.014 1032
4 2 50 0.019 3.191 1551
5 5 20 0.847 3.362 2302
6 10 10 1.268 3.449 2814
7 25 4 1.71 3.541 3474
8 50 2 1.991 3.599 3972
9 100 1 2.24 3.651 4473
10 200 0.5 2.467 3.698 4984